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Import tzdata 2018a

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Changes: https://github.com/eggert/tz/blob/2018a/NEWS

MFC after:	3 days
This commit is contained in:
Philip Paeps 2018-01-16 18:36:25 +00:00
commit f2fcff28d0
16 changed files with 452 additions and 198 deletions
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156
contrib/tzdata/Makefile
View File

@ -42,36 +42,63 @@ POSIXRULES= America/New_York
# Also see TZDEFRULESTRING below, which takes effect only
# if the time zone files cannot be accessed.
# Everything gets put in subdirectories of. . .
TOPDIR= /usr/local
# Installation locations.
#
# The defaults are suitable for Debian, except that if REDO is
# posix_right or right_posix then files that Debian puts under
# /usr/share/zoneinfo/posix and /usr/share/zoneinfo/right are instead
# put under /usr/share/zoneinfo-posix and /usr/share/zoneinfo-leaps,
# respectively. Problems with the Debian approach are discussed in
# the commentary for the right_posix rule (below).
# Destination directory, which can be used for staging.
# 'make DESTDIR=/stage install' installs under /stage (e.g., to
# /stage/etc/localtime instead of to /etc/localtime). Files under
# /stage are not intended to work as-is, but can be copied by hand to
# the root directory later. If DESTDIR is empty, 'make install' does
# not stage, but installs directly into production locations.
DESTDIR =
# Everything is installed into subdirectories of TOPDIR, and used there.
# TOPDIR should be empty (meaning the root directory),
# or a directory name that does not end in "/".
# TOPDIR should be empty or an absolute name unless you're just testing.
TOPDIR =
# The default local time zone is taken from the file TZDEFAULT.
TZDEFAULT = $(TOPDIR)/etc/localtime
# The subdirectory containing installed program and data files, and
# likewise for installed files that can be shared among architectures.
# These should be relative file names.
USRDIR = usr
USRSHAREDIR = $(USRDIR)/share
# "Compiled" time zone information is placed in the "TZDIR" directory
# (and subdirectories).
# Use an absolute path name for TZDIR unless you're just testing the software.
# TZDIR_BASENAME should not contain "/" and should not be ".", ".." or empty.
TZDIR_BASENAME= zoneinfo
TZDIR= $(TOPDIR)/etc/$(TZDIR_BASENAME)
TZDIR = $(TOPDIR)/$(USRSHAREDIR)/$(TZDIR_BASENAME)
# Types to try, as an alternative to time_t. int64_t should be first.
TIME_T_ALTERNATIVES= int64_t int32_t uint32_t uint64_t
# The "tzselect" and (if you do "make INSTALL") "date" commands go in:
BINDIR = $(TOPDIR)/$(USRDIR)/bin
# The "tzselect", "zic", and "zdump" commands get installed in. . .
# The "zdump" command goes in:
ZDUMPDIR = $(BINDIR)
ETCDIR= $(TOPDIR)/etc
# If you "make INSTALL", the "date" command gets installed in. . .
BINDIR= $(TOPDIR)/bin
# The "zic" command goes in:
ZICDIR = $(TOPDIR)/$(USRDIR)/sbin
# Manual pages go in subdirectories of. . .
MANDIR= $(TOPDIR)/man
MANDIR = $(TOPDIR)/$(USRSHAREDIR)/man
# Library functions are put in an archive in LIBDIR.
LIBDIR = $(TOPDIR)/$(USRDIR)/lib
LIBDIR= $(TOPDIR)/lib
# Types to try, as an alternative to time_t. int64_t should be first.
TIME_T_ALTERNATIVES = int64_t int32_t uint32_t uint64_t
# If you want only POSIX time, with time values interpreted as
# seconds since the epoch (not counting leap seconds), use
@ -105,11 +132,14 @@ REDO= posix_right
TZDATA_TEXT= leapseconds tzdata.zi
# For backward-compatibility links for old zone names, use
# BACKWARD= backward
# If you also want the link US/Pacific-New, even though it is confusing
# and is planned to be removed from the database eventually, use
# BACKWARD= backward pacificnew
# To omit these links, use
# BACKWARD=
BACKWARD= backward pacificnew
BACKWARD= backward
# If you want out-of-scope and often-wrong data from the file 'backzone', use
# PACKRATDATA= backzone
@ -313,7 +343,7 @@ ZFLAGS=
# How to use zic to install tz binary files.
ZIC_INSTALL= $(ZIC) -d $(DESTDIR)$(TZDIR) $(LEAPSECONDS)
ZIC_INSTALL= $(ZIC) -d '$(DESTDIR)$(TZDIR)' $(LEAPSECONDS)
# The name of a Posix-compliant 'awk' on your system.
AWK= awk
@ -341,8 +371,8 @@ SGML_CATALOG_FILES= \
VALIDATE = nsgmls
VALIDATE_FLAGS = -s -B -wall -wno-unused-param
VALIDATE_ENV = \
SGML_CATALOG_FILES=$(SGML_CATALOG_FILES) \
SGML_SEARCH_PATH=$(SGML_SEARCH_PATH) \
SGML_CATALOG_FILES='$(SGML_CATALOG_FILES)' \
SGML_SEARCH_PATH='$(SGML_SEARCH_PATH)' \
SP_CHARSET_FIXED=YES \
SP_ENCODING=UTF-8
@ -396,7 +426,7 @@ GZIPFLAGS= -9n
#MAKE= make
cc= cc
CC= $(cc) -DTZDIR=\"$(TZDIR)\"
CC= $(cc) -DTZDIR='"$(TZDIR)"'
AR= ar
@ -421,7 +451,7 @@ MANTXTS= newctime.3.txt newstrftime.3.txt newtzset.3.txt \
date.1.txt
COMMON= calendars CONTRIBUTING LICENSE Makefile \
NEWS README theory.html version
WEB_PAGES= tz-art.htm tz-how-to.html tz-link.htm
WEB_PAGES= tz-art.html tz-how-to.html tz-link.html
DOCS= $(MANS) date.1 $(MANTXTS) $(WEB_PAGES)
PRIMARY_YDATA= africa antarctica asia australasia \
europe northamerica southamerica
@ -431,7 +461,7 @@ TDATA= $(YDATA) $(NDATA)
ZONETABLES= zone1970.tab zone.tab
TABDATA= iso3166.tab $(TZDATA_TEXT) $(ZONETABLES)
LEAP_DEPS= leapseconds.awk leap-seconds.list
TZDATA_ZI_DEPS= zishrink.awk $(TDATA) $(PACKRATDATA)
TZDATA_ZI_DEPS= zishrink.awk version $(TDATA) $(PACKRATDATA)
DATA= $(YDATA) $(NDATA) backzone iso3166.tab leap-seconds.list \
leapseconds yearistype.sh $(ZONETABLES)
AWK_SCRIPTS= checklinks.awk checktab.awk leapseconds.awk zishrink.awk
@ -457,7 +487,7 @@ VERSION_DEPS= \
newctime.3 newstrftime.3 newtzset.3 northamerica \
pacificnew private.h \
southamerica strftime.c systemv theory.html \
time2posix.3 tz-art.htm tz-how-to.html tz-link.htm \
time2posix.3 tz-art.html tz-how-to.html tz-link.html \
tzfile.5 tzfile.h tzselect.8 tzselect.ksh \
workman.sh yearistype.sh \
zdump.8 zdump.c zic.8 zic.c \
@ -473,35 +503,41 @@ all: tzselect yearistype zic zdump libtz.a $(TABDATA)
ALL: all date $(ENCHILADA)
install: all $(DATA) $(REDO) $(MANS)
mkdir -p $(DESTDIR)$(ETCDIR) $(DESTDIR)$(TZDIR) \
$(DESTDIR)$(LIBDIR) \
$(DESTDIR)$(MANDIR)/man3 $(DESTDIR)$(MANDIR)/man5 \
$(DESTDIR)$(MANDIR)/man8
$(ZIC_INSTALL) -l $(LOCALTIME) -p $(POSIXRULES)
cp -f $(TABDATA) $(DESTDIR)$(TZDIR)/.
cp tzselect zic zdump $(DESTDIR)$(ETCDIR)/.
cp libtz.a $(DESTDIR)$(LIBDIR)/.
$(RANLIB) $(DESTDIR)$(LIBDIR)/libtz.a
cp -f newctime.3 newtzset.3 $(DESTDIR)$(MANDIR)/man3/.
cp -f tzfile.5 $(DESTDIR)$(MANDIR)/man5/.
cp -f tzselect.8 zdump.8 zic.8 $(DESTDIR)$(MANDIR)/man8/.
mkdir -p '$(DESTDIR)$(BINDIR)' \
'$(DESTDIR)$(ZDUMPDIR)' '$(DESTDIR)$(ZICDIR)' \
'$(DESTDIR)$(LIBDIR)' \
'$(DESTDIR)$(MANDIR)/man3' '$(DESTDIR)$(MANDIR)/man5' \
'$(DESTDIR)$(MANDIR)/man8'
$(ZIC_INSTALL) -l $(LOCALTIME) -p $(POSIXRULES) \
-t '$(DESTDIR)$(TZDEFAULT)'
cp -f $(TABDATA) '$(DESTDIR)$(TZDIR)/.'
cp tzselect '$(DESTDIR)$(BINDIR)/.'
cp zdump '$(DESTDIR)$(ZDUMPDIR)/.'
cp zic '$(DESTDIR)$(ZICDIR)/.'
cp libtz.a '$(DESTDIR)$(LIBDIR)/.'
$(RANLIB) '$(DESTDIR)$(LIBDIR)/libtz.a'
cp -f newctime.3 newtzset.3 '$(DESTDIR)$(MANDIR)/man3/.'
cp -f tzfile.5 '$(DESTDIR)$(MANDIR)/man5/.'
cp -f tzselect.8 zdump.8 zic.8 '$(DESTDIR)$(MANDIR)/man8/.'
INSTALL: ALL install date.1
mkdir -p $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)/man1
cp date $(DESTDIR)$(BINDIR)/.
cp -f date.1 $(DESTDIR)$(MANDIR)/man1/.
mkdir -p '$(DESTDIR)$(BINDIR)' '$(DESTDIR)$(MANDIR)/man1'
cp date '$(DESTDIR)$(BINDIR)/.'
cp -f date.1 '$(DESTDIR)$(MANDIR)/man1/.'
version: $(VERSION_DEPS)
{ (type git) >/dev/null 2>&1 && \
V=`git describe --match '[0-9][0-9][0-9][0-9][a-z]*' \
--abbrev=7 --dirty` || \
V=$(VERSION); } && \
V='$(VERSION)'; } && \
printf '%s\n' "$$V" >$@.out
mv $@.out $@
# This file can be tailored by setting BACKWARD, PACKRATDATA, etc.
tzdata.zi: $(TZDATA_ZI_DEPS)
LC_ALL=C $(AWK) -f zishrink.awk $(TDATA) $(PACKRATDATA) >$@.out
version=`sed 1q version` && \
LC_ALL=C $(AWK) -v version="$$version" -f zishrink.awk \
$(TDATA) $(PACKRATDATA) >$@.out
mv $@.out $@
version.h: version
@ -529,12 +565,13 @@ leapseconds: $(LEAP_DEPS)
# Arguments to pass to submakes of install_data.
# They can be overridden by later submake arguments.
INSTALLARGS = \
BACKWARD=$(BACKWARD) \
DESTDIR=$(DESTDIR) \
BACKWARD='$(BACKWARD)' \
DESTDIR='$(DESTDIR)' \
LEAPSECONDS='$(LEAPSECONDS)' \
PACKRATDATA='$(PACKRATDATA)' \
TZDIR=$(TZDIR) \
YEARISTYPE=$(YEARISTYPE) \
TZDEFAULT='$(TZDEFAULT)' \
TZDIR='$(TZDIR)' \
YEARISTYPE='$(YEARISTYPE)' \
ZIC='$(ZIC)'
# 'make install_data' installs one set of tz binary files.
@ -558,16 +595,16 @@ right_only:
# You must replace all of $(TZDIR) to switch from not using leap seconds
# to using them, or vice versa.
right_posix: right_only
rm -fr $(DESTDIR)$(TZDIR)-leaps
ln -s $(TZDIR_BASENAME) $(DESTDIR)$(TZDIR)-leaps || \
$(MAKE) $(INSTALLARGS) TZDIR=$(TZDIR)-leaps right_only
$(MAKE) $(INSTALLARGS) TZDIR=$(TZDIR)-posix posix_only
rm -fr '$(DESTDIR)$(TZDIR)-leaps'
ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-leaps' || \
$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only
$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only
posix_right: posix_only
rm -fr $(DESTDIR)$(TZDIR)-posix
ln -s $(TZDIR_BASENAME) $(DESTDIR)$(TZDIR)-posix || \
$(MAKE) $(INSTALLARGS) TZDIR=$(TZDIR)-posix posix_only
$(MAKE) $(INSTALLARGS) TZDIR=$(TZDIR)-leaps right_only
rm -fr '$(DESTDIR)$(TZDIR)-posix'
ln -s '$(TZDIR_BASENAME)' '$(DESTDIR)$(TZDIR)-posix' || \
$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-posix' posix_only
$(MAKE) $(INSTALLARGS) TZDIR='$(TZDIR)-leaps' right_only
# This obsolescent rule is present for backwards compatibility with
# tz releases 2014g through 2015g. It should go away eventually.
@ -764,7 +801,7 @@ set-timestamps.out: $(ENCHILADA)
check_public:
$(MAKE) maintainer-clean
$(MAKE) "CFLAGS=$(GCC_DEBUG_FLAGS)" ALL
$(MAKE) CFLAGS='$(GCC_DEBUG_FLAGS)' ALL
mkdir -p public.dir
for i in $(TDATA) tzdata.zi; do \
$(zic) -v -d public.dir $$i 2>&1 || exit; \
@ -790,8 +827,11 @@ check_time_t_alternatives:
REDO='$(REDO)' \
install && \
diff $$quiet_option -r \
time_t.dir/int64_t/etc/zoneinfo \
time_t.dir/$$type/etc/zoneinfo && \
time_t.dir/int64_t/etc \
time_t.dir/$$type/etc && \
diff $$quiet_option -r \
time_t.dir/int64_t/usr/share \
time_t.dir/$$type/usr/share && \
case $$type in \
int32_t) range=-2147483648,2147483647;; \
uint32_t) range=0,4294967296;; \
@ -800,9 +840,9 @@ check_time_t_alternatives:
*) range=-10000000000,10000000000;; \
esac && \
echo checking $$type zones ... && \
time_t.dir/int64_t/etc/zdump -V -t $$range $$zones \
time_t.dir/int64_t/usr/bin/zdump -V -t $$range $$zones \
>time_t.dir/int64_t.out && \
time_t.dir/$$type/etc/zdump -V -t $$range $$zones \
time_t.dir/$$type/usr/bin/zdump -V -t $$range $$zones \
>time_t.dir/$$type.out && \
diff -u time_t.dir/int64_t.out time_t.dir/$$type.out \
|| exit; \

120
contrib/tzdata/NEWS
View File

@ -1,5 +1,101 @@
News for the tz database
Release 2018a - 2018-01-12 22:29:21 -0800
Briefly:
São Tomé and Príncipe switched from +00 to +01.
Brazil's DST will now start on November's first Sunday.
Ireland's standard time is now in the summer, not the winter.
Use Debian-style installation locations, instead of 4.3BSD-style.
New zic option -t.
Changes to past and future time stamps
São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
Changes to future time stamps
Starting in 2018 southern Brazil will begin DST on November's
first Sunday instead of October's third Sunday. (Thanks to
Steffen Thorsen.)
Changes to past time stamps
A discrepancy of 4 s in timestamps before 1931 in South Sudan has
been corrected. The 'backzone' and 'zone.tab' files did not agree
with the 'africa' and 'zone1970.tab' files. (Problem reported by
Michael Deckers.)
The abbreviation invented for Bolivia Summer Time (1931-2) is now
BST instead of BOST, to be more consistent with the convention
used for Latvian Summer Time (1918-9) and for British Summer Time.
Changes to tm_isdst
Change Europe/Dublin so that it observes Irish Standard Time (UT
+01) in summer and GMT (as negative daylight-saving) in winter,
instead of observing standard time (GMT) in winter and Irish
Summer Time (UT +01) in summer. This change does not affect UT
offsets or abbreviations; it affects only whether timestamps are
considered to be standard time or daylight-saving time, as
expressed in the tm_isdst flag of C's struct tm type.
(Discrepancy noted by Derick Rethans.)
Changes to build procedure
The default installation locations have been changed to mostly
match Debian circa 2017, instead of being designed as an add-on to
4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
locations more precisely. (This responds to suggestions from
Brian Inglis and from Steve Summit.)
The default installation procedure no longer creates the
backward-compatibility link US/Pacific-New, which causes
confusion during user setup (e.g., see Debian bug 815200).
Use 'make BACKWARD="backward pacificnew"' to create the link
anyway, for now. Eventually we plan to remove the link entirely.
tzdata.zi now contains a version-number comment.
(Suggested by Tom Lane.)
The Makefile now quotes values like BACKWARD more carefully when
passing them to the shell. (Problem reported by Zefram.)
Builders no longer need to specify -DHAVE_SNPRINTF on platforms
that have snprintf and use pre-C99 compilers. (Problem reported
by Jon Skeet.)
Changes to code
zic has a new option -t FILE that specifies the location of the
file that determines local time when TZ is unset. The default for
this location can be configured via the new TZDEFAULT makefile
macro, which defaults to /etc/localtime.
Diagnostics and commentary now distinguish UT from UTC more
carefully; see theory.html for more information about UT vs UTC.
zic has been ported to GCC 8's -Wstringop-truncation option.
(Problem reported by Martin Sebor.)
Changes to documentation and commentary
The zic man page now documents the longstanding behavior that
times and years can be out of the usual range, with negative times
counting backwards from midnight and with year 0 preceding year 1.
(Problem reported by Michael Deckers.)
The theory.html file now mentions the POSIX limit of six chars
per abbreviation, and lists alphabetic abbreviations used.
The files tz-art.htm and tz-link.htm have been renamed to
tz-art.html and tz-link.html, respectively, for consistency with
other file names and to simplify web server configuration.
Release 2017c - 2017-10-20 14:49:34 -0700
Briefly:
@ -895,8 +991,8 @@ Release 2015f - 2015-08-10 18:06:56 -0700
(Thanks to Jon Skeet and Arthur David Olson.) Constraints on
simultaneity are now documented.
The two characters '%z' in a zone format now stand for the UTC
offset, e.g., '-07' for seven hours behind UTC and '+0530' for
The two characters '%z' in a zone format now stand for the UT
offset, e.g., '-07' for seven hours behind UT and '+0530' for
five hours and thirty minutes ahead. This better supports time
zone abbreviations conforming to POSIX.1-2001 and later.
@ -1019,13 +1115,13 @@ Release 2015c - 2015-04-11 08:55:55 -0700
The spring 1988 transition was 1988-10-09, not 1988-10-02.
The fall 1990 transition was 1990-03-11, not 1990-03-18.
Assume no UTC offset change for Pacific/Easter on 1890-01-01,
Assume no UT offset change for Pacific/Easter on 1890-01-01,
and omit all transitions on Pacific/Easter from 1942 through 1946
since we have no data suggesting that they existed.
One more zone has been turned into a link, as it differed
from an existing zone only for older time stamps. As usual,
this change affects UTC offsets in pre-1970 time stamps only.
this change affects UT offsets in pre-1970 time stamps only.
The zone's old contents have been moved to the 'backzone' file.
The affected zone is America/Montreal.
@ -1055,7 +1151,7 @@ Release 2015b - 2015-03-19 23:28:11 -0700
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UTC offsets in pre-1970 time stamps only.
these changes affect UT offsets in pre-1970 time stamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: America/Antigua, America/Cayman,
Pacific/Midway, and Pacific/Saipan.
@ -1107,7 +1203,7 @@ Release 2015a - 2015-01-29 22:35:20 -0800
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UTC offsets in pre-1970 time stamps only.
these changes affect UT offsets in pre-1970 time stamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
and Asia/Muscat.
@ -1154,7 +1250,7 @@ Release 2014j - 2014-11-10 17:37:11 -0800
Some more zones have been turned into links, when they differed
from existing zones only for older time stamps. As usual,
these changes affect UTC offsets in pre-1970 time stamps only.
these changes affect UT offsets in pre-1970 time stamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
@ -1244,7 +1340,7 @@ Release 2014h - 2014-09-25 18:59:03 -0700
Some more zones have been turned into links, when they differed
from existing zones only for older timestamps. As usual,
these changes affect UTC offsets in pre-1970 timestamps only.
these changes affect UT offsets in pre-1970 timestamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Africa/Blantyre, Africa/Bujumbura,
Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
@ -1329,7 +1425,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700
Some more zones have been turned into links, when they differed
from existing zones only for older timestamps. As usual,
these changes affect UTC offsets in pre-1970 timestamps only.
these changes affect UT offsets in pre-1970 timestamps only.
Their old contents have been moved to the 'backzone' file.
The affected zones are: Africa/Bangui, Africa/Brazzaville,
Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
@ -1479,7 +1575,7 @@ Release 2014f - 2014-08-05 17:42:36 -0700
standard and daylight saving time the abbreviations are AEST and AEDT
instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
and AWST/AWDT are now used instead of the former CST, CWST, and WST.
This change does not affect UTC offsets, only time zone abbreviations.
This change does not affect UT offsets, only time zone abbreviations.
(Thanks to Rich Tibbett and many others.)
Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
@ -1516,8 +1612,8 @@ Release 2014f - 2014-08-05 17:42:36 -0700
Treindl sent helpful translations of two papers by Guo Qingsheng.)
Some zones have been turned into links, when they differed from existing
zones only for older UTC offsets where data entries were likely invented.
These changes affect UTC offsets in pre-1970 timestamps only. This is
zones only for older UT offsets where data entries were likely invented.
These changes affect UT offsets in pre-1970 timestamps only. This is
similar to the change in release 2013e, except this time for western
Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,

2
contrib/tzdata/README
View File

@ -11,7 +11,7 @@ changes made by political bodies to time zone boundaries, UTC offsets,
and daylight-saving rules.
See <https://www.iana.org/time-zones/repository/tz-link.html> or the
file tz-link.htm for how to acquire the code and data. Once acquired,
file tz-link.html for how to acquire the code and data. Once acquired,
read the comments in the file 'Makefile' and make any changes needed
to make things right for your system, especially if you are using some
platform other than GNU/Linux. Then run the following commands,

16
contrib/tzdata/africa
View File

@ -158,7 +158,6 @@ Link Africa/Abidjan Africa/Freetown # Sierra Leone
Link Africa/Abidjan Africa/Lome # Togo
Link Africa/Abidjan Africa/Nouakchott # Mauritania
Link Africa/Abidjan Africa/Ouagadougou # Burkina Faso
Link Africa/Abidjan Africa/Sao_Tome # São Tomé and Príncipe
Link Africa/Abidjan Atlantic/St_Helena # St Helena
# Djibouti
@ -425,7 +424,7 @@ Link Africa/Nairobi Indian/Mayotte
#
# The Nautical Almanac for the Year 1970, p 264, is the source for -0:44:30.
#
# In 1972 Liberia was the last country to switch from a UTC offset
# In 1972 Liberia was the last country to switch from a UT offset
# that was not a multiple of 15 or 20 minutes. The 1972 change was on
# 1972-01-07, according to an entry dated 1972-01-04 on p 330 of:
# Presidential Papers: First year of the administration of
@ -1037,6 +1036,19 @@ Zone Indian/Reunion 3:41:52 - LMT 1911 Jun # Saint-Denis
# Inaccessible, Nightingale: uninhabited
# São Tomé and Príncipe
# From Steffen Thorsen (2018-01-08):
# Multiple sources tell that São Tomé changed from UTC to UTC+1 as
# they entered the year 2018.
# From Michael Deckers (2018-01-08):
# the switch is from 01:00 to 02:00 ... [Decree No. 25/2017]
# http://www.mnec.gov.st/index.php/publicacoes/documentos/file/90-decreto-lei-n-25-2017
Zone Africa/Sao_Tome 0:26:56 - LMT 1884
-0:36:45 - LMT 1912 # Lisbon Mean Time
0:00 - GMT 2018 Jan 1 01:00
1:00 - WAT
# Senegal
# See Africa/Abidjan.

18
contrib/tzdata/asia
View File

@ -50,7 +50,7 @@
# 9:00 KST KDT Korea when at +09
# 9:30 ACST Australian Central Standard Time
# Otherwise, these tables typically use numeric abbreviations like +03
# and +0330 for integer hour and minute UTC offsets. Although earlier
# and +0330 for integer hour and minute UT offsets. Although earlier
# editions invented alphabetic time zone abbreviations for every
# offset, this did not reflect common practice.
#
@ -647,17 +647,17 @@ Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30
# time", in which abolished the adoption of Western Standard Time in
# western islands (listed above), which means the whole Japan
# territory, including later occupations, adopt Japan Central Time
# (UTC+9). The adoption began on Oct 1, 1937. The original text can
# (UT+9). The adoption began on Oct 1, 1937. The original text can
# be found on Wikisource:
# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
#
# That is, the time zone of Taipei switched to UTC+9 on Oct 1, 1937.
# That is, the time zone of Taipei switched to UT+9 on Oct 1, 1937.
# From Yu-Cheng Chuang (2014-07-02):
# I've found more evidence about when the time zone was switched from UTC+9
# back to UTC+8 after WW2. I believe it was on Sep 21, 1945. In a document
# I've found more evidence about when the time zone was switched from UT+9
# back to UT+8 after WW2. I believe it was on Sep 21, 1945. In a document
# during Japanese era [1] in which the officer told the staff to change time
# zone back to Western Standard Time (UTC+8) on Sep 21. And in another
# zone back to Western Standard Time (UT+8) on Sep 21. And in another
# history page of National Cheng Kung University [2], on Sep 21 there is a
# note "from today, switch back to Western Standard Time". From these two
# materials, I believe that the time zone change happened on Sep 21. And
@ -1505,7 +1505,7 @@ Rule Japan 1950 1951 - May Sun>=1 2:00 1:00 D
#
# ...the Showa Emperor announced Ordinance No. 529 of Showa Year 12 ... which
# means the whole Japan territory, including later occupations, adopt Japan
# Central Time (UTC+9). The adoption began on Oct 1, 1937.
# Central Time (UT+9). The adoption began on Oct 1, 1937.
# https://ja.wikisource.org/wiki/明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@ -2066,8 +2066,8 @@ Zone Asia/Kuching 7:21:20 - LMT 1926 Mar
# Maldives
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Indian/Maldives 4:54:00 - LMT 1880 # Male
4:54:00 - MMT 1960 # Male Mean Time
Zone Indian/Maldives 4:54:00 - LMT 1880 # Malé
4:54:00 - MMT 1960 # Malé Mean Time
5:00 - +05
# Mongolia

6
contrib/tzdata/australasia
View File

@ -683,8 +683,8 @@ Zone Pacific/Guadalcanal 10:39:48 - LMT 1912 Oct # Honiara
# From Steffen Thorsen (2012-07-25)
# ... we double checked by calling hotels and offices based in Tokelau asking
# about the time there, and they all told a time that agrees with UTC+13....
# Shanks says UTC-10 from 1901 [but] ... there is a good chance the change
# actually was to UTC-11 back then.
# Shanks says UT-10 from 1901 [but] ... there is a good chance the change
# actually was to UT-11 back then.
#
# From Paul Eggert (2012-07-25)
# A Google Books snippet of Appendix to the Journals of the House of
@ -1450,7 +1450,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
#
# From Paul Eggert (2006-03-22):
# The Department of Internal Affairs (DIA) maintains a brief history,
# as does Carol Squires; see tz-link.htm for the full references.
# as does Carol Squires; see tz-link.html for the full references.
# Use these sources in preference to Shanks & Pottenger.
#
# For Chatham, IATA SSIM (1991/1999) gives the NZ rules but with

10
contrib/tzdata/backzone
View File

@ -145,11 +145,6 @@ Zone Africa/Gaborone 1:43:40 - LMT 1885
Zone Africa/Harare 2:04:12 - LMT 1903 Mar
2:00 - CAT
# South Sudan
Zone Africa/Juba 2:06:24 - LMT 1931
2:00 Sudan CA%sT 2000 Jan 15 12:00
3:00 - EAT
# Uganda
Zone Africa/Kampala 2:09:40 - LMT 1928 Jul
3:00 - EAT 1930
@ -242,11 +237,6 @@ Zone Africa/Porto-Novo 0:10:28 - LMT 1912 Jan 1
0:00 - GMT 1934 Feb 26
1:00 - WAT
# São Tomé and Príncipe
Zone Africa/Sao_Tome 0:26:56 - LMT 1884
-0:36:32 - LMT 1912 # Lisbon Mean Time
0:00 - GMT
# Mali (northern)
Zone Africa/Timbuktu -0:12:04 - LMT 1912
0:00 - GMT

108
contrib/tzdata/europe
View File

@ -68,14 +68,15 @@
# 0:00 WET WEST WEMT Western Europe
# 0:19:32.13 AMT* NST* Amsterdam, Netherlands Summer (1835-1937)
# 1:00 BST British Standard (1968-1971)
# 1:00 IST GMT Irish Standard (1968-) with winter DST
# 1:00 CET CEST CEMT Central Europe
# 1:00:14 SET Swedish (1879-1899)
# 1:36:34 RMT* LST* Riga, Latvian Summer (1880-1926)*
# 2:00 EET EEST Eastern Europe
# 3:00 MSK MSD MDST* Moscow
# From Peter Ilieve (1994-12-04),
# The original six [EU members]: Belgium, France, (West) Germany, Italy,
# From Peter Ilieve (1994-12-04), re EEC/EC/EU members:
# The original six: Belgium, France, (West) Germany, Italy,
# Luxembourg, the Netherlands.
# Plus, from 1 Jan 73: Denmark, Ireland, United Kingdom.
# Plus, from 1 Jan 81: Greece.
@ -278,16 +279,31 @@
# The following claim by Shanks & Pottenger is possible though doubtful;
# we'll ignore it for now.
# * Dublin's 1971-10-31 switch was at 02:00, even though London's was 03:00.
# From Paul Eggert (2017-12-04):
#
#
# Whitman says Dublin Mean Time was -0:25:21, which is more precise than
# Shanks & Pottenger.
# Perhaps this was Dunsink Observatory Time, as Dunsink Observatory
# (8 km NW of Dublin's center) seemingly was to Dublin as Greenwich was
# to London. For example:
# Dunsink Observatory (8 km NW of Dublin's center) was to Dublin as
# Greenwich was to London. For example:
#
# "Timeball on the ballast office is down. Dunsink time."
# -- James Joyce, Ulysses
#
# The abbreviation DMT stood for "Dublin Mean Time" or "Dunsink Mean Time";
# this being Ireland, opinions differed.
#
# Whitman says Dublin/Dunsink Mean Time was UT-00:25:21, which agrees
# with measurements of recent visitors to the Meridian Room of Dunsink
# Observatory; see Malone D. Dunsink and timekeeping. 2016-01-24.
# <https://www.maths.tcd.ie/~dwmalone/time/dunsink.html>. Malone
# writes that the Nautical Almanac listed UT-00:25:22 until 1896, when
# it moved to UT-00:25:21.1 (I confirmed that the 1893 edition used
# the former and the 1896 edition used the latter). Evidently the
# news of this change propagated slowly, as Milne 1899 still lists
# UT-00:25:22 and cites the International Telegraph Bureau. As it is
# not clear that there was any practical significance to the change
# from UT-00:25:22 to UT-00:25:21.1 in civil timekeeping, omit this
# transition for now and just use the latter value, omitting its
# fraction since our format cannot represent fractions.
# "Countess Markievicz ... claimed that the [1916] abolition of Dublin Mean Time
# was among various actions undertaken by the 'English' government that
@ -347,12 +363,28 @@
# regulations. I spoke this morning with the Secretary of the Department of
# Justice (tel +353 1 678 9711) who confirmed to me that the correct name is
# "Irish Summer Time", abbreviated to "IST".
#
# From Paul Eggert (2017-12-07):
# The 1996 anonymous contributor's goal was to determine the correct
# abbreviation for summer time in Dublin and so the contributor
# focused on the "IST", not on the "Irish Summer Time". Though the
# "IST" was correct, the "Irish Summer Time" appears to have been an
# error, as Ireland's Standard Time (Amendment) Act, 1971 states that
# standard time in Ireland remains at UT +01 and is observed in
# summer, and that Greenwich mean time is observed in winter. (Thanks
# to Derick Rethans for pointing out the error.) That is, when
# Ireland amended the 1968 act that established UT +01 as Irish
# Standard Time, it left standard time unchanged and established GMT
# as a negative daylight saving time in winter. So, in this database
# IST stands for Irish Summer Time for timestamps before 1968, and for
# Irish Standard Time after that. See:
# http://www.irishstatutebook.ie/eli/1971/act/17/enacted/en/print
# Michael Deckers (2017-06-01) gave the following URLs for Ireland's
# Summer Time Act, 1925 and Summer Time Orders, 1926 and 1947:
# http://www.irishstatutebook.ie/eli/1925/act/8/enacted/en/print.html
# http://www.irishstatutebook.ie/eli/1926/sro/919/made/en/print.html
# http://www.irishstatutebook.ie/eli/1947/sro/71/made/en/print.html
# http://www.irishstatutebook.ie/eli/1925/act/8/enacted/en/print
# http://www.irishstatutebook.ie/eli/1926/sro/919/made/en/print
# http://www.irishstatutebook.ie/eli/1947/sro/71/made/en/print
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
# Summer Time Act, 1916
@ -476,9 +508,20 @@ Link Europe/London Europe/Jersey
Link Europe/London Europe/Guernsey
Link Europe/London Europe/Isle_of_Man
# The following is like GB-Eire and EU, except with standard time in
# summer and negative daylight saving time in winter.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Eire 1971 only - Oct 31 2:00u -1:00 GMT
Rule Eire 1972 1980 - Mar Sun>=16 2:00u 0 IST
Rule Eire 1972 1980 - Oct Sun>=23 2:00u -1:00 GMT
Rule Eire 1981 max - Mar lastSun 1:00u 0 IST
Rule Eire 1981 1989 - Oct Sun>=23 1:00u -1:00 GMT
Rule Eire 1990 1995 - Oct Sun>=22 1:00u -1:00 GMT
Rule Eire 1996 max - Oct lastSun 1:00u -1:00 GMT
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Dublin -0:25:00 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00s # Dublin MT
-0:25:21 - DMT 1916 May 21 2:00s
-0:25:21 1:00 IST 1916 Oct 1 2:00s
0:00 GB-Eire %s 1921 Dec 6 # independence
0:00 GB-Eire GMT/IST 1940 Feb 25 2:00s
@ -487,16 +530,15 @@ Zone Europe/Dublin -0:25:00 - LMT 1880 Aug 2
0:00 1:00 IST 1947 Nov 2 2:00s
0:00 - GMT 1948 Apr 18 2:00s
0:00 GB-Eire GMT/IST 1968 Oct 27
1:00 - IST 1971 Oct 31 2:00u
0:00 GB-Eire GMT/IST 1996
0:00 EU GMT/IST
1:00 Eire IST/GMT
###############################################################################
# Europe
# EU rules are for the European Union, previously known as the EC, EEC,
# Common Market, etc.
# The following rules are for the European Union and for its
# predecessor organization, the European Communities.
# For brevity they are called "EU rules" elsewhere in this file.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule EU 1977 1980 - Apr Sun>=1 1:00u 1:00 S
@ -929,7 +971,7 @@ Zone Europe/Prague 0:57:44 - LMT 1850
# The page http://www.retsinfo.dk/_GETDOCI_/ACCN/A18930008330-REGL
# confirms this, and states that the law was put forth 1893-03-29.
#
# The EU treaty with effect from 1973:
# The EU [actually, EEC and Euratom] treaty with effect from 1973:
# http://www.retsinfo.dk/_GETDOCI_/ACCN/A19722110030-REGL
#
# This provoked a new law from 1974 to make possible summer time changes
@ -985,9 +1027,10 @@ Zone Atlantic/Faroe -0:27:04 - LMT 1908 Jan 11 # Tórshavn
# East Greenland and Franz Josef Land, but we don't know their time zones.
# My source for this is Wilhelm Dege's book mentioned under Svalbard.
#
# From Paul Eggert (2006-03-22):
# Greenland joined the EU as part of Denmark, obtained home rule on 1979-05-01,
# and left the EU on 1985-02-01. It therefore should have been using EU
# From Paul Eggert (2017-12-10):
# Greenland joined the European Communities as part of Denmark,
# obtained home rule on 1979-05-01, and left the European Communities
# on 1985-02-01. It therefore should have been using EU
# rules at least through 1984. Shanks & Pottenger say Scoresbysund and Godthåb
# used C-Eur rules after 1980, but IATA SSIM (1991/1996) says they use EU
# rules since at least 1991. Assume EU rules since 1980.
@ -1301,7 +1344,7 @@ Zone Europe/Paris 0:09:21 - LMT 1891 Mar 15 0:01
# From Markus Kuhn (1998-09-29):
# The German time zone web site by the Physikalisch-Technische
# Bundesanstalt contains DST information back to 1916.
# [See tz-link.htm for the URL.]
# [See tz-link.html for the URL.]
# From Jörg Schilling (2002-10-23):
# In 1945, Berlin was switched to Moscow Summer time (GMT+4) by
@ -1398,7 +1441,7 @@ Zone Europe/Athens 1:34:52 - LMT 1895 Sep 14
1:00 Greece CE%sT 1944 Apr 4
2:00 Greece EE%sT 1981
# Shanks & Pottenger say it switched to C-Eur in 1981;
# go with EU instead, since Greece joined it on Jan 1.
# go with EU rules instead, since Greece joined Jan 1.
2:00 EU EE%sT
# Hungary
@ -2097,7 +2140,7 @@ Zone Europe/Warsaw 1:24:00 - LMT 1880
# IATA SSIM (1991/1992) reports that the Azores were at -1:00.
# IATA SSIM (1993-02) says +0:00; later issues (through 1996-09) say -1:00.
# Guess that the Azores changed to EU rules in 1992 (since that's when Portugal
# harmonized with the EU), and that they stayed +0:00 that winter.
# harmonized with EU rules), and that they stayed +0:00 that winter.
#
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
# DSH writes that despite Decree 1,469 (1915), the change to the clocks was not
@ -2772,9 +2815,9 @@ Zone Asia/Omsk 4:53:30 - LMT 1919 Nov 14
#
# https://regnum.ru/news/society/1957270.html
# has some historical data for Altai Krai:
# before 1957: west part on UTC+6, east on UTC+7
# after 1957: UTC+7
# since 1995: UTC+6
# before 1957: west part on UT+6, east on UT+7
# after 1957: UT+7
# since 1995: UT+6
# http://barnaul.rusplt.ru/index/pochemu_altajskij_kraj_okazalsja_v_neprivychnom_chasovom_pojase-17648.html
# confirms that and provides more details including 1995-05-28 transition date.
@ -3582,6 +3625,17 @@ Zone Europe/Zurich 0:34:08 - LMT 1853 Jul 16 # See above comment.
# The change is permanent, so this is the new standard time in Turkey.
# It takes effect today, which is not much notice.
# From Kıvanç Yazan (2017-10-28):
# Turkey will go back to Daylight Saving Time starting 2018-10.
# http://www.resmigazete.gov.tr/eskiler/2017/10/20171028-5.pdf
#
# From Even Scharning (2017-11-08):
# ... today it was announced that the DST will become "continuous":
# http://www.hurriyet.com.tr/son-dakika-yaz-saati-uygulamasi-surekli-hale-geldi-40637482
# From Paul Eggert (2017-11-08):
# Although Google Translate misfires on that source, it looks like
# Turkey reversed last month's decision, and so will stay at +03.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Turkey 1916 only - May 1 0:00 1:00 S
Rule Turkey 1916 only - Oct 1 0:00 0 -

14
contrib/tzdata/northamerica
View File

@ -348,6 +348,18 @@ Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58
# Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota,
# western Tennessee, most of Texas, Wisconsin
# From Paul Eggert (2018-01-07):
# In 1869 the Chicago Astronomical Society contracted with the city to keep
# time. Though delayed by the Great Fire, by 1880 a wire ran from the
# Dearborn Observatory (on the University of Chicago campus) to City Hall,
# which then sent signals to police and fire stations. However, railroads got
# their time signals from the Allegheny Observatory, the Madison Observatory,
# the Ann Arbor Observatory, etc., so their clocks did not agree with each
# other or with the city's official time. The confusion took some years to
# clear up. See:
# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04.
# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-Its-Time-Zones/
# From Larry M. Smith (2006-04-26) re Wisconsin:
# https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf
# is currently enforced at the 01:00 time of change. Because the local
@ -1896,7 +1908,7 @@ Zone America/Edmonton -7:33:52 - LMT 1906 Sep
# manager of the Creston & District Museum. The article was written in May 2009.
# http://www.ilovecreston.com/?p=articles&t=spec&ar=260
# According to the article, Creston has not changed its clocks since June 1918.
# i.e. Creston has been stuck on UTC-7 for 93 years.
# i.e. Creston has been stuck on UT-7 for 93 years.
# Dawson Creek, on the other hand, changed its clocks as recently as April 1972.
# Unfortunately the exact date for the time change in June 1918 remains

27
contrib/tzdata/pacificnew
View File

@ -1,27 +0,0 @@
# This file is in the public domain, so clarified as of
# 2009-05-17 by Arthur David Olson.
# From Arthur David Olson (1989-04-05):
# On 1989-04-05, the U. S. House of Representatives passed (238-154) a bill
# establishing "Pacific Presidential Election Time"; it was not acted on
# by the Senate or signed into law by the President.
# You might want to change the "PE" (Presidential Election) below to
# "Q" (Quadrennial) to maintain three-character zone abbreviations.
# If you're really conservative, you might want to change it to "D".
# Avoid "L" (Leap Year), which won't be true in 2100.
# If Presidential Election Time is ever established, replace "XXXX" below
# with the year the law takes effect and uncomment the "##" lines.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
## Rule Twilite XXXX max - Apr Sun>=1 2:00 1:00 D
## Rule Twilite XXXX max uspres Oct lastSun 2:00 1:00 PE
## Rule Twilite XXXX max uspres Nov Sun>=7 2:00 0 S
## Rule Twilite XXXX max nonpres Oct lastSun 2:00 0 S
# Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
## Zone America/Los_Angeles-PET -8:00 US P%sT XXXX
## -8:00 Twilite P%sT
# For now...
Link America/Los_Angeles US/Pacific-New ##

21
contrib/tzdata/southamerica
View File

@ -25,7 +25,7 @@
# https://www.jstor.org/stable/1774359
#
# These tables use numeric abbreviations like -03 and -0330 for
# integer hour and minute UTC offsets. Although earlier editions used
# integer hour and minute UT offsets. Although earlier editions used
# alphabetic time zone abbreviations, these abbreviations were
# invented and did not reflect common practice.
@ -579,7 +579,7 @@ Link America/Curacao America/Aruba
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/La_Paz -4:32:36 - LMT 1890
-4:32:36 - CMT 1931 Oct 15 # Calamarca MT
-4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
-4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
-4:00 - -04
# Brazil
@ -908,12 +908,25 @@ Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
# [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
# 3rd Feb Sunday. There is an exception on the return date when this is
# the Carnival Sunday then the return date will be the next Sunday...
Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S
Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
# Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
# added Bahia.
Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
# Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
# removed Bahia and added Tocantins.
# Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
# removed Tocantins.
Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
# From Steffen Thorsen (2017-12-18):
# According to many media sources, next year's DST start in Brazil will move to
# the first Sunday of November, and it will stay like that for the years after.
# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
# From Steffen Thorsen (2017-12-20):
# http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
@ -1068,7 +1081,7 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914
# From Paul Eggert (2015-04-03):
# Shanks & Pottenger says America/Santiago introduced standard time in
# 1890 and rounds its UTC offset to 70W40; guess that in practice this
# 1890 and rounds its UT offset to 70W40; guess that in practice this
# was the same offset as in 1916-1919. It also says Pacific/Easter
# standardized on 109W22 in 1890; assume this didn't change the clocks.
#

144
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@ -52,6 +52,10 @@ However, the database is not designed for and does not suffice for
applications requiring accurate handling of all past times everywhere,
as it would take far too much effort and guesswork to record all
details of pre-1970 civil timekeeping.
Athough some information outside the scope of the database is
collected in a file <code>backzone</code> that is distributed along
with the database proper, this file is less reliable and does not
necessarily follow database guidelines.
</p>
<p>
@ -240,7 +244,7 @@ to name time
zone rules. It is intended to be an exhaustive list of names for
geographic regions as described above; this is a subset of the names
in the data. Although a '<code>zone1970.tab</code>' location's longitude
corresponds to its LMT offset with one hour for every 15 degrees east
corresponds to its LMT offset with one hour for every 15&deg; east
longitude, this relationship is not exact.
</p>
@ -279,7 +283,7 @@ Here are the general rules used for choosing time zone abbreviations,
in decreasing order of importance:
<ul>
<li>
Use three or more characters that are ASCII alphanumerics or
Use three to six characters that are ASCII alphanumerics or
'<code>+</code>' or '<code>-</code>'.
Previous editions of this database also used characters like
'<code> </code>' and '<code>?</code>', but these
@ -297,7 +301,7 @@ in decreasing order of importance:
'<code>+</code>' and '<code>-</code>' are safe in all locales.
In other words, in the C locale the POSIX extended regular
expression <code>[-+[:alnum:]]{3,}</code> should match
expression <code>[-+[:alnum:]]{3,6}</code> should match
the abbreviation.
This guarantees that all abbreviations could have been
specified by a POSIX TZ string.
@ -308,12 +312,96 @@ in decreasing order of importance:
We assume that applications translate them to other languages
as part of the normal localization process; for example,
a French application might translate 'EST' to 'HNE'.
<p><small>These abbreviations (for standard/daylight/etc. time) are:
ACST/ACDT Australian Central,
AST/ADT/APT/AWT/ADDT Atlantic,
AEST/AEDT Australian Eastern,
AHST/AHDT Alaska-Hawaii,
AKST/AKDT Alaska,
AWST/AWDT Australian Western,
BST/BDT Bering,
CAT/CAST Central Africa,
CET/CEST/CEMT Central European,
ChST Chamorro,
CST/CDT/CWT/CPT/CDDT Central [North America],
CST/CDT China,
GMT/BST/IST/BDST Greenwich,
EAT East Africa,
EST/EDT/EWT/EPT/EDDT Eastern [North America],
EET/EEST Eastern European,
GST Guam,
HST/HDT Hawaii,
HKT/HKST Hong Kong,
IST India,
IST/GMT Irish,
IST/IDT/IDDT Israel,
JST/JDT Japan,
KST/KDT Korea,
MET/MEST Middle European (a backward-compatibility alias for Central European),
MSK/MSD Moscow,
MST/MDT/MWT/MPT/MDDT Mountain,
NST/NDT/NWT/NPT/NDDT Newfoundland,
NST/NDT/NWT/NPT Nome,
NZMT/NZST New Zealand through 1945,
NZST/NZDT New Zealand 1946&ndash;present,
PKT/PKST Pakistan,
PST/PDT/PWT/PPT/PDDT Pacific,
SAST South Africa,
SST Samoa,
WAT/WAST West Africa,
WET/WEST/WEMT Western European,
WIB Waktu Indonesia Barat,
WIT Waktu Indonesia Timur,
WITA Waktu Indonesia Tengah,
YST/YDT/YWT/YPT/YDDT Yukon</small>.</p>
</li>
<li>
For zones whose times are taken from a city's longitude, use the
traditional <var>x</var>MT notation, e.g. 'PMT' for
Paris Mean Time.
The only name like this in current use is 'GMT'.
traditional <var>x</var>MT notation. The only abbreviation like this
in current use is 'GMT'. The others are for timestamps before 1960,
except that Monrovia Mean Time persisted until 1972. Typically,
numeric abbreviations (e.g., '<code>-</code>004430' for MMT) would
cause trouble here, as the numeric strings would exceed the POSIX length limit.
<p><small>These abbreviations are:
AMT Amsterdam, Asunción, Athens;
BMT Baghdad, Bangkok, Batavia, Bern, Bogotá, Bridgetown, Brussels, Bucharest;
CMT Calamarca, Caracas, Chisinau, Colón, Copenhagen, Córdoba;
DMT Dublin/Dunsink;
EMT Easter;
FFMT Fort-de-France;
FMT Funchal;
GMT Greenwich;
HMT Havana, Helsinki, Horta, Howrah;
IMT Irkutsk, Istanbul;
JMT Jerusalem;
KMT Kaunas, Kiev, Kingston;
LMT Lima, Lisbon, local, Luanda;
MMT Macassar, Madras, Malé, Managua, Minsk, Monrovia, Montevideo, Moratuwa,
Moscow;
PLMT Phù Liễn;
PMT Paramaribo, Paris, Perm, Pontianak, Prague;
PMMT Port Moresby;
QMT Quito;
RMT Rangoon, Riga, Rome;
SDMT Santo Domingo;
SJMT San José;
SMT Santiago, Simferopol, Singapore, Stanley;
TBMT Tbilisi;
TMT Tallinn, Tehran;
WMT Warsaw</small>.</p>
<p><small>A few abbreviations also follow the pattern that
GMT/BST established for time in the UK. They are:
CMT/BST for Calamarca Mean Time and Bolivian Summer Time
1890&ndash;1932, DMT/IST for Dublin/Dunsink Mean Time and Irish Summer Time
1880&ndash;1916, MMT/MST/MDST for Moscow 1880&ndash;1919, and RMT/LST
for Riga Mean Time and Latvian Summer time 1880&ndash;1926.
An extra-special case is SET for Swedish Time (<em>svensk
normaltid</em>) 1879&ndash;1899, 3&deg; west of the Stockholm
Observatory.</small></p>
</li>
<li>
Use 'LMT' for local mean time of locations before the introduction
@ -340,32 +428,6 @@ in decreasing order of importance:
history tends to use numeric abbreviations and a particular
entry could go either way, use a numeric abbreviation.
</li>
</ul>
[The remaining guidelines predate the introduction of <code>%z</code>.
They are problematic as they mean tz data entries invent
notation rather than record it. These guidelines are now
deprecated and the plan is to gradually move to <code>%z</code> for
inhabited locations and to "<code>-</code>00" for uninhabited locations.]
<ul>
<li>
If there is no common English abbreviation, abbreviate the English
translation of the usual phrase used by native speakers.
If this is not available or is a phrase mentioning the country
(e.g. "Cape Verde Time"), then:
<ul>
<li>
When a country is identified with a single or principal zone,
append 'T' to the country's ISO code, e.g. 'CVT' for
Cape Verde Time. For summer time append 'ST';
for double summer time append 'DST'; etc.
</li>
<li>
Otherwise, take the first three letters of an English place
name identifying each zone and append 'T', 'ST', etc.
as before; e.g. 'CHAST' for CHAtham Summer Time.
</li>
</ul>
</li>
<li>
Use UT (with time zone abbreviation '<code>-</code>00') for
locations while uninhabited. The leading
@ -376,10 +438,10 @@ in decreasing order of importance:
</ul>
<p>
Application writers should note that these abbreviations are ambiguous
in practice: e.g. 'CST' has a different meaning in China than
it does in the United States. In new applications, it's often better
to use numeric UT offsets like '<code>-</code>0600' instead of time zone
abbreviations like 'CST'; this avoids the ambiguity.
in practice: e.g., 'CST' means one thing in China and something else
in North America, and 'IST' can refer to time in India, Ireland or
Israel. To avoid ambiguity, use numeric UT offsets like
'<code>-</code>0600' instead of time zone abbreviations like 'CST'.
</p>
</section>
@ -388,7 +450,7 @@ abbreviations like 'CST'; this avoids the ambiguity.
<h2 id="accuracy">Accuracy of the tz database</h2>
<p>
The tz database is not authoritative, and it surely has errors.
Corrections are welcome and encouraged; see the file CONTRIBUTING.
Corrections are welcome and encouraged; see the file <code>CONTRIBUTING</code>.
Users requiring authoritative data should consult national standards
bodies and the references cited in the database's comments.
</p>
@ -598,7 +660,7 @@ POSIX has the following properties and limitations.
and daylight saving time (DST) zone names.
Starting with POSIX.1-2001, <var>std</var>
and <var>dst</var> may also be
in a quoted form like '<code>&lt;UTC+10&gt;</code>'; this allows
in a quoted form like '<code>&lt;+09&gt;</code>'; this allows
"<code>+</code>" and "<code>-</code>" in the names.
</dd>
<dt><var>offset</var></dt><dd>
@ -646,7 +708,7 @@ POSIX has the following properties and limitations.
</dd>
</dl>
Here is an example POSIX TZ string for New Zealand after 2007.
It says that standard time (NZST) is 12 hours ahead of UTC,
It says that standard time (NZST) is 12 hours ahead of UT,
and that daylight saving time (NZDT) is observed from September's
last Sunday at 02:00 until April's first Sunday at 03:00:
@ -678,7 +740,7 @@ POSIX has the following properties and limitations.
applications that an administrator wants used only at certain
times &ndash;
without regard to whether the user has fiddled the TZ environment
variable. While an administrator can "do everything in UTC" to get
variable. While an administrator can "do everything in UT" to get
around the problem, doing so is inconvenient and precludes handling
daylight saving time shifts - as might be required to limit phone
calls to off-peak hours.)
@ -902,7 +964,7 @@ Interface changes in a release attempt to preserve compatibility with
recent releases. For example, tz data files typically do not rely on
recently-added <code>zic</code> features, so that users can run
older <code>zic</code> versions to process newer data
files. <a href="tz-link.htm">Sources for time zone and daylight
files. <a href="tz-link.html">Sources for time zone and daylight
saving time data</a> describes how
releases are tagged and distributed.
</p>

2
contrib/tzdata/version
View File

@ -1 +1 @@
2017c
2018a

1
contrib/tzdata/zishrink.awk
View File

@ -144,6 +144,7 @@ function output_saved_lines(i)
}
BEGIN {
print "# version", version
print "# This zic input file is in the public domain."
}

2
contrib/tzdata/zone.tab
View File

@ -372,7 +372,7 @@ SM +4355+01228 Europe/San_Marino
SN +1440-01726 Africa/Dakar
SO +0204+04522 Africa/Mogadishu
SR +0550-05510 America/Paramaribo
SS +0451+03136 Africa/Juba
SS +0451+03137 Africa/Juba
ST +0020+00644 Africa/Sao_Tome
SV +1342-08912 America/El_Salvador
SX +180305-0630250 America/Lower_Princes

3
contrib/tzdata/zone1970.tab
View File

@ -133,7 +133,7 @@ CA +6043-13503 America/Whitehorse Pacific - Yukon (south)
CA +6404-13925 America/Dawson Pacific - Yukon (north)
CC -1210+09655 Indian/Cocos
CH,DE,LI +4723+00832 Europe/Zurich Swiss time
CI,BF,GM,GN,ML,MR,SH,SL,SN,ST,TG +0519-00402 Africa/Abidjan
CI,BF,GM,GN,ML,MR,SH,SL,SN,TG +0519-00402 Africa/Abidjan
CK -2114-15946 Pacific/Rarotonga
CL -3327-07040 America/Santiago Chile (most areas)
CL -5309-07055 America/Punta_Arenas Region of Magallanes
@ -322,6 +322,7 @@ SE +5920+01803 Europe/Stockholm
SG +0117+10351 Asia/Singapore
SR +0550-05510 America/Paramaribo
SS +0451+03137 Africa/Juba
ST +0020+00644 Africa/Sao_Tome
SV +1342-08912 America/El_Salvador
SY +3330+03618 Asia/Damascus
TC +2128-07108 America/Grand_Turk